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Investment Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Available-for-sale securities    
Due within one year, Amortized cost $ 14,646  
Due after one year but within five years, Amortized cost 17,311  
Due after five years but within ten years, Amortized cost 19,262  
Due after ten years, Amortized cost 162,939  
Amortized Cost 530,146 491,615
Due within one year, Fair value 14,657  
Due after one year but within five years, Fair value 17,978  
Due after five years but within ten years, Fair value 20,238  
Due after ten years, Fair value 157,174  
Fair Value 526,607 482,430
Held-to-maturity securities    
Due within one year, Amortized cost 430  
Due after one year but within five years, Amortized cost 865  
Due after five years but within ten years, Amortized cost     
Due after ten years, Amortized cost     
Total, Amortized Cost 1,295 3,490
Due within one year, Fair value 434  
Due after one year but within five years, Fair value 884  
Due after five years but within ten years, Fair value     
Due after ten years, Fair value     
Fair Value 1,318 3,532
Mortgage-backed securities [Member]
   
Available-for-sale securities    
Amortized Cost 315,569 290,364
Fair Value 316,015 290,132
Equity Securities [Member]
   
Available-for-sale securities    
Amortized Cost 419 419
Fair Value 545 521
Debt securities [Member]
   
Available-for-sale securities    
Total, Amortized cost 214,158  
Fair Value $ 210,047